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A box plot summary reports minimum 12, first quartile 50, median 62, third quartile 74, and maximum 98. What is the interquartile range?
A86
B36
C24
D48
Answer & Solution
Correct answer: C. 24
1. The interquartile range measures the spread of the middle half of the data.
2. It subtracts the first quartile from the third quartile: IQR = 74 - 50.
3. That gives an IQR of 24.
4. Option A, 86, is the full range from maximum to minimum, a different spread measure entirely.
_Source: OpenStax Introductory Business Statistics (CC BY 4.0), Ch 2 "Descriptive Statistics", section 2.2 Measures of the Location of the Data_
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